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On May 5, 2012, I participated in a hike to Eagle Peak led by the San Diego Natural History Museum Canyoneers, which followed the route described in Jerry Schad's Afoot & Afield in San Diego County.
I surveyed Boulder Creek Rd. as I drove to the trailhead. Readings near the south end are unreliable because my GPS lost track of its satellites seeral times. It often does that right after it is turned on.
On the way out, we encountered a lot of ticks in the wooded area shown on the topo. However, we didn't notice any ticks on the way back, and another group that came after us didn't have a tick problem. Presumably, we passed through the area right at the tick breakfast hour! Temperature and humidity may have had something to do with it.
Most of the trail to Eagle Peak runs along the remains of an old fire road, which is shown on the topo. After leaving the wooded area, the trail gets a little vague, and there is a side trail to the left (south) that leads to a saddle point. However, the trail goes almost due west along a series of hills on a ridge, so it isn't very hard to follow.
Transcript of survey.
Data plotted on topo
Philip J. Erdelsky